WASHINGTON - Security tightened Sunday on Capitol Hill as
grief-stricken lawmakers, their spouses and staffers were briefed
on their own safety after the shooting of Rep. Gabrielle
Giffords.

About 800 members of Congress, aides and spouses discussed
security in a conference call with Capitol Police Chief Philip
Morse, FBI officials and other congressional security staff
members.

During the call, House Speaker John Boehner, R-Ohio, said he had
asked security officials to "conduct an in-depth security review"
for members of Congress when they meet Wednesday. A briefing will
also be held for lawmakers' district office directors.

At the White House, President Obama called on Americans to
observe a moment of silence at 11 a.m. EST today (9 a.m. in
Tucson). He called it "a time for us to come together as a nation
in prayer or reflection, keeping the victims and their families
closely at heart." The president plans to observe the moment with
his staff on the White House South Lawn.

House Democratic Caucus Chairman John Larson, D-Conn., said
during the conference call that new members of Congress and spouses
were especially concerned about security.

Congressional leaders are accompanied by plainclothes Capitol
Police officers. Rank-and-file members typically don't get
protection outside the Capitol, and there was no indication that
policy will change.

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